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UGL is working with ElectraNet to construct the new high-voltage transmission line which will connect Oz Minerals’ Prominent Hill Mine, located 130km south east of Cooper Pedy, to the South Australian electricity grid.

The work includes all line design, procurement and construction for the transmission line, which will run for approximately 130km and is expected to be completed in 2020.

Originating from Davenport substation near port Augusta, the transmission line starts at 275kV voltage and then reduces to 132kV at the Mount Gunson south substation. It then connects to an existing 132kV line between Olympic Dam and Prominent Hill substations. The line will provide a reliable power supply from the South Australian high voltage network helping to keep the mine operational.

The design of a transmission line involves multiple disciplines within UGL. The UGL design team assists the client with route selection and then designs the towers, footings, overhead wiring, and assesses the safety of the line regarding earthing, magnetic and electric fields, radio interference investigations and noise assessment. 

Building a large piece of infrastructure in such a remote area brings its challenges. One of the first tasks for the team was clearing areas along the route, which can be sandy, rocky, or covered in bush and shrubs, ensuring easy access for construction. Later these access areas will be used for maintenance of the transmission line.

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